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Finding the Fourth Proportional to 78,712.60, 118,058.10 and 26,116.60

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Solution

The fourth proportional to 78,712.60, 118,058.10 and 26,116.60 is: 39,171.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,712.60 : 118,058.10 = 26,116.60 : x
  2. Step 2: Convert to fraction form
    78,712.60/118,058.10 = 26,116.60/x
  3. Step 3: Cross multiply
    78,712.60x = 118,058.10 × 26,116.60
  4. Step 4: Simplify right side
    78,712.60x = 3,083,276,174.46
  5. Step 5: Solve for x
    x = 3,083,276,174.46/78,712.60
  6. Step 6: Final answer
    x = 39,171.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.